Investigation of turbulence and skin friction modification in particle-laden channel flow using lattice Boltzmann method

doi:10.1007/s10483-018-2316-8

Abstract

Abstract:

Interaction between turbulence and particles is investigated in a channel flow. The fluid motion is calculated using direct numerical simulation (DNS) with a lattice Boltzmann (LB) method, and particles are tracked in a Lagrangian framework through the action of force imposed by the fluid. The particle diameter is smaller than the Kolmogorov length scale, and the point force is used to represent the feedback force of particles on the turbulence. The effects of particles on the turbulence and skin friction coefficient are examined with different particle inertias and mass loadings. Inertial particles suppress intensities of the spanwise and wall-normal components of velocity, and the Reynolds shear stress. It is also found that, relative to the reference particle-free flow, the overall mean skin-friction coefficient is reduced by particles. Changes of near wall turbulent structures such as longer and more regular streamwise low-speed streaks and less ejections and sweeps are the manifestation of drag reduction.

Key words: Sand-driven flow, two-phase flow, two-fluid model, three-fluid model, particle, skin friction, lattice Boltzmann (LB) equation, channel flow, turbulence modulation

2010 MSC Number:

76T25

Ming PAN, Qingxiang LI, Shuai TANG, Yuhong DONG. Investigation of turbulence and skin friction modification in particle-laden channel flow using lattice Boltzmann method. Applied Mathematics and Mechanics (English Edition), 2018, 39(4): 477-488.

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